| Year | Count |
|---|---|
| 1922 | 5 |
| 1957 | 12 |
| 1959 | 5 |
| 1963 | 5 |
| 1965 | 14 |
| 1968 | 18 |
| 1971 | 10 |
| 1972 | 9 |
| 1973 | 6 |
| 1975 | 14 |
| 1976 | 5 |
| 1977 | 24 |
| 1978 | 5 |
| 1979 | 38 |
| 1980 | 5 |
| 1981 | 22 |
| 1983 | 10 |
| 1985 | 6 |
| 1986 | 8 |
| 1987 | 8 |
| 1988 | 18 |
| 1989 | 5 |
| 1990 | 29 |
| 1991 | 6 |
| 1993 | 15 |
| 1994 | 11 |
| 1995 | 8 |
| 1996 | 22 |
| 1997 | 9 |
| 1998 | 22 |
| 1999 | 10 |
| 2000 | 21 |
| 2001 | 7 |
| 2002 | 5 |
| 2005 | 6 |
| 2006 | 15 |
| 2007 | 13 |
| 2008 | 13 |
| 2016 | 12 |
| 2018 | 5 |